[PATCH v4 24/39] unwind_user/sframe: Remove .sframe section on detected corruption
From: Josh Poimboeuf <jpoimboe@kernel.org>
Date: 2025-01-22 02:32:17
Also in:
linux-perf-users, linux-toolchains, lkml
Subsystem:
the rest, userspace stack unwinding · Maintainers:
Linus Torvalds, Josh Poimboeuf, Steven Rostedt
To avoid continued attempted use of a bad .sframe section, remove it on demand when the first sign of corruption is detected. Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> --- kernel/unwind/sframe.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/kernel/unwind/sframe.c b/kernel/unwind/sframe.c
index 1a35615a361e..66b920441692 100644
--- a/kernel/unwind/sframe.c
+++ b/kernel/unwind/sframe.c@@ -294,6 +294,10 @@ int sframe_find(unsigned long ip, struct unwind_user_frame *frame) ret = __find_fre(sec, &fde, ip, frame); end: user_read_access_end(); + + if (ret == -EFAULT) + WARN_ON_ONCE(sframe_remove_section(sec->sframe_start)); + return ret; }
--
2.48.1